To be on the safe side, you should use a backup, too. I have a pill baby. Drugs like antibiotics can lower the effectiveness of the pill. If you are not too concerned about having a baby, then by all means, fire away. But if you are not ready to handle a screaming bundle of shitty-pants joy, maybe you should still keep wearing a raincoat. Bummer, I know, but even at max effectiveness, there is still a 2% chance of knocking up your lady each time you unleash the dogs of war. If your gal is on an antibiotic, that chance can jump up to 20% or more.